The invention relates to the process of making bricks from return sand of foundry waste wherein the process involves steps of preparing the synergestic composition of building bricks by compressing the waste sand, soil, slag and water in a proportion alongwith cement of an amount of 7% -10% by weight as a binder, in a compactor to provide a mixture of wet compressive strength of at least 43 to 45 kg/cm.sup.2, then molding the mixture in a press to form green solid brick, then removing the green brick from the mold and transporting the green brick to a shaded area for curing for 7 days, and then the curing bricks are covered with straw or gunny bag and sprayed with water and finally to form building brick with relatively low porosity, high compressive strength, and low thermal conductivity.
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机译：本发明涉及由铸造废料的返回砂制造砖的方法，其中该方法包括通过将废砂，土壤，矿渣和水与水泥一起按7％的比例压缩来制备建筑砖的协同组合物的步骤。 -10％（重量）作为粘合剂，在压实机中提供至少43至45 kg / cm 2的湿抗压强度混合物，然后在压机中模压形成生坯，然后除去将生坯从模具中取出，然后将其运到阴凉处进行固化7天，然后用稻草或麻袋覆盖固化砖，并喷水，最后制成孔隙率相对较低，抗压强度高的建筑砖，导热系数低。
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